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INVESTMENT ACTIVITY (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 14, 2021 USD ($) item | Dec. 09, 2021 facility item | Jun. 29, 2021 USD ($) | Dec. 22, 2020 USD ($) | Sep. 29, 2020 USD ($) shares | Dec. 16, 2019 USD ($) | Oct. 07, 2019 USD ($) | Sep. 17, 2019 USD ($) | Sep. 06, 2019 USD ($) item | Sep. 05, 2019 | Jun. 25, 2019 USD ($) | Jun. 06, 2019 USD ($) facility property | Jun. 05, 2019 USD ($) property | Jul. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) facility property shares | Dec. 31, 2020 USD ($) facility item shares | Dec. 31, 2019 USD ($) facility shares | Dec. 31, 2021 USD ($) property facility
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains from sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,698,000 | $ 6,710,000 | $ 1,508,000 |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8
Acquisition of noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,397,000 |  | $ 40,605,000 |
OP units redeemed | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500,000 | 100,000 | 80,000 |
Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 232,400,000
HVP III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | property |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |
Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price |  |  |  |  |  |  | $ 4,100,000 |  |  |  |  |  |  |  |  |  |  |
Gains from sales of real estate, net |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |
New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Units issued (in shares) | shares |  |  |  |  | 276,497 |  |  |  |  |  |  |  |  |  |  |  |  |
Units issued |  |  |  |  | $ 9,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  |  | $ 14,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of OP Shares |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities under contract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  | 500,000
Expected aggregate purchase or sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000,000.0 |  |  | $ 32,000,000.0
Number of facilities under contract | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 1
Self storage under construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities under contract | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  | 3
Development costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 66,700,000 |  |  | $ 66,700,000
Expected construction cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 97,300,000 |  |  | $ 97,300,000
Self storage under construction | New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities under contract | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  | 2
Self storage under construction | Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities under contract | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  | 1
Self Storage Facility in Newton, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1
Self Storage Facility in Newton, MA | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,800,000
Self-storage facility in East Meadow, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Self-storage facility in East Meadow, NY | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,900,000
Self-storage facility in King of Prussia, PA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Self-storage facility in King of Prussia, PA | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,800,000
Self-storage Facility in Brooklyn, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Self-storage Facility in Brooklyn, NY | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,900,000
Self-storage Facility in Arlington, VA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Self-storage Facility in Arlington, VA | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,400,000
Self-storage Facility in Waltham, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Self-storage Facility in Waltham, MA | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000
Self Storage Facility in Queens, NY I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Self Storage Facility in Queens, NY I | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,500,000
Self Storage Facility in Bayonne, NJ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities, construction completed and opened |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Self Storage Facility in Bayonne, NJ | Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Construction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,100,000
2021 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66 |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,801,251,000 |  |  |
2021 Acquisitions | LAACO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  | 57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible value of the in-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 109,700,000 |  |  | 109,700,000
Estimated life |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,100,000 |  |  |
Number of facilities under contract | facility |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures | item |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Acquisitions | Acquisitions | LAACO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Acquisitions | Texas | LAACO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Acquisitions | Nevada | LAACO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  | 13 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Acquisitions | California | LAACO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Acquisitions | Arizona | LAACO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Acquisitions | Self-storage facilities located in US |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,800,000 |  |  |
Intangible value of the in-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,900,000 |  |  | 11,900,000
Estimated life |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,600,000 |  |  |
2021 Acquisitions | Self-storage facilities located in US | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Acquisitions | Self-storage facilities located in US | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Acquisitions | Self-storage facilities located in US | Nevada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Acquisitions | Self-storage facilities located in US | Pennsylvania |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
2021 Acquisitions | Self-storage facilities located in US | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Acquisitions | Self-storage facilities located in US | Illinois |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Acquisitions | Self-storage facilities located in US | Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Acquisitions | Self-storage facility in Anoka, MN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000.0 |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
2021 Acquisitions | Self Storage Facility in Newton, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures | item | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Aggregate sale price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,800,000 |  |  |
Gains from sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,700,000 |  |  |
2021 Dispositions | LAACO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains from sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
2021 Dispositions | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Dispositions | Colorado |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Dispositions | Nevada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
2021 Dispositions | North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
2020 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21 |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 735,875,000 |  |
2020 Acquisitions | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
2020 Acquisitions | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |
2020 Acquisitions | New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
2020 Acquisitions | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
2020 Acquisitions | Nevada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
2020 Acquisitions | Virginia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
2020 Acquisitions | New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
2020 Acquisitions | Self-storage facilities located in US |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 195,900,000 |  |
2020 Acquisitions | Self-storage facilities located in US | Leases, Acquired-in-Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible value of the in-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,400,000 |  |
Estimated life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,300,000 | $ 2,100,000 |  |
2020 Acquisitions | Self-storage Facility in Bronx, NY I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate property acquired, land subject to ground lease |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,500,000 |  |  |  |
Decrease in right-of-use asset |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,100,000 |  |  |  |
Decrease in Operating Lease Liability |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |
2020 Acquisitions | Self-storage facilities located in New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |
Number of real estate property acquisition tranches | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 540,000,000.0 |  |
Cash paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 210,500,000 |  |
Issuance of OP Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,100,000 |  |
Repayments of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,200,000 |  |
Units issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,272,023 |  |
Number of properties, assumed mortgage | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |
Assumed mortgage debt, at fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 169,200,000 |  |
Outstanding principal balance of mortgage debt assumed on acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 154,400,000 |  |  | $ 154,400,000
Premium on debt assumed on acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,800,000 |  |
2020 Acquisitions | Self-storage facilities located in New York | Leases, Acquired-in-Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible value of the in-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,600,000 |  |
Estimated life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,600,000 |  |  |
Number of assumed ground leases | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Number of facilities acquired with existing ground leases, for which the leases were classified as finance leases | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Number of facilities acquired with existing ground leases, for which the leases were classified as operating leases | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
2020 Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,750,000 |  |
2020 Dispositions | Self-storage facilities located in New York |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price |  |  |  | $ 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains from sales of real estate, net |  |  |  | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29 |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 246,600,000 |
2019 Acquisitions | HVP III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |
Number of self-storage facilities sold | facility |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 128,300,000 |  |  |  |  |  |
Intangible value of the in-place leases |  |  |  |  |  |  |  |  |  |  |  | $ 14,300,000 |  |  |  |  |  |
Estimated life |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000.0 | $ 8,300,000 |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |
Acquisition of remaining interest in real estate ventures (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Acquisition, assets recorded |  |  |  |  |  |  |  |  |  |  |  | $ 137,500,000 |  |  |  |  |  |
Acquisition, previously held equity interest |  |  |  |  |  |  |  |  |  |  |  | 10,600,000 |  |  |  |  |  |
Acquisition, cash acquired |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |  |  |
2019 Acquisitions | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
2019 Acquisitions | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |
2019 Acquisitions | Massachusetts | HVP III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |
2019 Acquisitions | Maryland |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
2019 Acquisitions | California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
2019 Acquisitions | Arizona |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
2019 Acquisitions | Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
2019 Acquisitions | Georgia | HVP III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
2019 Acquisitions | North Carolina | HVP III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
2019 Acquisitions | South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
2019 Acquisitions | South Carolina | HVP III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |
2019 Acquisitions | Tennessee | HVP III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
2019 Acquisitions | Self-storage facilities located in US |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 118,300,000 |
Cash paid for acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,900,000 |
Issuance of OP Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000 |
2019 Acquisitions | Self-storage facilities located in US | Leases, Acquired-in-Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible value of the in-place leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,200,000 |
Estimated life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |
Amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 4,300,000 | $ 1,900,000 |
2019 Acquisitions | Maryland Asset March 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities acquired | facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,000,000 |
2019 Dispositions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate sale price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,146,000 |
Joint Venture | Self Storage Facilities in New York and New Jersey |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Joint Venture | Self Storage Facility in Newton, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ 3,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minority ownership interest (as a percent) | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of noncontrolling interest | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 13,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Self Storage Facility in Newton, MA | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of remaining interest in real estate ventures (as a percent) | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Self-storage facility in East Meadow, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Put option ownership percentage in joint venture exercised (as a percent) |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to put ownership interest in the venture |  |  | $ 6,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Self-storage Facility in Brooklyn, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of OP Shares |  |  |  |  | $ 9,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |
Units issued (in shares) | shares |  |  |  |  | 276,497 |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Self-storage Facility in Waltham, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  | $ 2,600,000 |  |  |  |  |  |  |  |  |
Acquisition, gain (loss) recognized |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |
Minority ownership interest (as a percent) |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Acquisition of noncontrolling interest |  |  |  |  |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  | $ 10,500,000 |  |  |  |  |  |  |  |  |
Number of joint ventures | item |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Joint Venture | Self-storage Facility in Waltham, MA | Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of remaining interest in real estate ventures (as a percent) |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Joint Venture | Self Storage Facility in Queens, NY I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Put option ownership percentage in joint venture exercised (as a percent) |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |
Option to put ownership interest in the venture |  |  |  |  |  |  |  | $ 15,200,000 |  |  |  |  |  |  |  |  |  |
Joint Venture | Self Storage Facility in Bayonne, NJ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Put option ownership percentage in joint venture exercised (as a percent) |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |
Option to put ownership interest in the venture |  |  |  |  |  |  |  |  |  |  | $ 11,500,000 |  |  |  |  |  |  |
Joint Venture | Self Storage Facility in Brooklyn, NY I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Put option ownership percentage in joint venture exercised (as a percent) |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Option to put ownership interest in the venture |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash portion of put option paid |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Cubesmart | Self Storage Facility in Newton, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Cubesmart | Self-storage facility in East Meadow, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Cubesmart | Self-storage facility in King of Prussia, PA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00%
Cubesmart | Self-storage Facility in Brooklyn, NY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Cubesmart | Self-storage Facility in Arlington, VA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00%
Cubesmart | Self-storage Facility in Waltham, MA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Cubesmart | Self Storage Facility in Queens, NY I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Cubesmart | Self Storage Facility in Bayonne, NJ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
HVP III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |  |
Aggregate sale price |  |  |  |  |  |  |  |  |  |  |  |  | $ 293,500,000 |  |  |  |  |
Gains from sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  | $ 106,700,000 |  |  |  |  |
Ownership interest held by the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |
HVP III | Florida |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
HVP III | Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
HVP III | North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
HVP III | South Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |
HVP III | Tennessee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self-storage facilities sold | property |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
HVP III | 2019 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-storage facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisition |  |  |  |  |  |  |  |  |  |  |  | $ 120,000,000.0 |  |  |  |  |  |
Amount of escrowed proceeds from sale of assets |  |  |  |  |  |  |  |  |  |  |  | $ 8,300,000 |  |  |  |  |  |

X
- Definition Amount of escrowed proceeds from sale of assets. + References No definition available. + Details
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Namespace Prefix: | cube_
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Balance Type: | credit
Period Type: | duration

X
- Definition Amount of total construction cost expected of the projects. + References No definition available. + Details
Name: | cube_ConstructionCostExpected
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The increase (decrease) during the period for right-of-use asset for operating lease. + References No definition available. + Details
Name: | cube_IncreaseDecreaseInRightOfUseAssetOperatingLease
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of facilities acquired with existing ground leases. + References No definition available. + Details
Name: | cube_NumberOfFacilitiesAcquiredAssumedGroundLeases
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of facilities acquired with existing ground leases, for which the leases were classified as finance leases. + References No definition available. + Details
Name: | cube_NumberOfFacilitiesAcquiredAssumedGroundLeasesClassifiedAsFinancing
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of facilities acquired with existing ground leases, for which the leases were classified as operating leases. + References No definition available. + Details
Name: | cube_NumberOfFacilitiesAcquiredAssumedGroundLeasesClassifiedAsOperating
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of self-storage facilities with construction completed and opened for operation during the period. + References No definition available. + Details
Name: | cube_NumberOfFacilitiesConstructionCompletedAndOpenedForOperation
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of facilities under contract. + References No definition available. + Details
Name: | cube_NumberOfFacilitiesUnderContract
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the information pertaining to number of joint ventures. + References No definition available. + Details
Name: | cube_NumberOfJointVentures
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of real estate properties that were acquired. + References No definition available. + Details
Name: | cube_NumberOfRealEstatePropertiesAcquired
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of real estate acquired properties of which mortgages were assumed. + References No definition available. + Details
Name: | cube_NumberOfRealEstatePropertiesAcquiredMortgagesAssumed
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of real estate properties that were sold. + References No definition available. + Details
Name: | cube_NumberOfRealEstatePropertiesSold
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of real estate property acquisition tranches. + References No definition available. + Details
Name: | cube_NumberOfRealEstatePropertyAcquisitionTranches
Namespace Prefix: | cube_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the option to put ownership interest in the venture. + References No definition available. + Details
Name: | cube_OptionToPutOwnershipInterestInVenture
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash portion of put option paid. + References No definition available. + Details
Name: | cube_OptionToPutOwnershipInterestInVentureCashPortion
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Put option ownership percentage in joint venture exercised. + References No definition available. + Details
Name: | cube_PutOptionInJointVenturePercentageExercised
Namespace Prefix: | cube_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the debt assumed on real estate acquisition. + References No definition available. + Details
Name: | cube_RealEstatePropertiesDebtAssumedOnAcquisition
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the premium on debt assumed on real estate acquisition. + References No definition available. + Details
Name: | cube_RealEstatePropertiesPremiumOnDebtAssumed
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Real estate property acquired, land subject to ground lease. + References No definition available. + Details
Name: | cube_RealEstatePropertyAcquisitionLandSubjectToGroundLease
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The expected value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | cube_SignificantAcquisitionsAndDisposalsExpectedAcquisitionCostsOrSaleProceeds
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the value of the operating units issued during the period. + References No definition available. + Details
Name: | cube_StockIssuedDuringPeriodOperatingUnits
Namespace Prefix: | cube_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Shares classified as temporary equity issued during the period. + References No definition available. + Details
Name: | cube_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | cube_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
Name: | us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The current amount of expenditures for a real estate project that has not yet been completed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_DevelopmentInProcess
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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